Lowrance 3300c still playing up

Hi i was told to upload new firmware on to my lowrance 3300c chartplotter,i have tried this to no avail,do you need special sd card or card reader,i can download from pc succesfully but unit is not accepting for some reason and is still flashing all the time but seems to be working perfectly
thank you john

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ORDo a soft reset. This may resolve your issues and will also keep your data on the device.Do a soft reset by:1. Having the device already off2. Press and hold the PAGES key3. Press and hold the PWR key4. Release both buttons when the USA map appears

If neither of those work, try a hard reset. This will however delete all stored data off your device.To do a hard reset:1. Have device off2. Press and hold the ZIN&ZOUT Keys at the same time3. Press and hold the PWR key4. Release both buttons when the USA map appears

Two requirements:
1) You must have version 1.4 software on your Endura. Remove the map card, press and hold (10 sec.) the menu key until software information appears to see what you have. Upgrades are available on Lowrance's website.
2) You must have the Endura Compatible LakeMaster map card. These were made available in May 2010. The packages have an "Endura Compatible" sticker on the front.
Call LakeMaster regarding your options if the card is not Endura compatible.
Moccasinboy

I am guessing that the card you are using is a NAVIONICS chart? There have been some Lowrance units that were made around the same time that have had problems recognizing a Navionics chart right from power up.

Make sure the LMS-332 has the latest firmware version which can be downloaded from http://www.lowrance.com/en/Products/Marine/Full-Size-SonarGPS-Chartplotter-Combos/LMS-332C/Downloads/LMS-332C-Software-Update/

If the update doesn't help, this is going to be a compatibility problem with the LMS-332 and that particular card. You will need to replace the card or upgrade to a newer unit...but probably can just get used to removing and replacing the card when you turn the unit on.

Because Lowrance doesn't publish the pin connections, neither in their user guide, neither on a convenient website - this is really a breakpoint for me - I checked GPS connector suppliers and I found different plugs, type and connection codes in Europe, where information comes with the unit as a EU - norm